Process for production of heat-exchanging bodies



H. F. B. JOHGENSEN. PROCESS FOR PRODUCTION OF HEAT EXCHANGING BODIES.

APPLICATION FILED JULY 24.1920. 19%2g63o Patented Sept. 12, 1922,

In venz ar':

Patented Sept 12, 1922.

UNITED STATES PATENT OFFICE.

PROCESS FOR PRODUCTION OF HEAT-EXCHANGING BODIES.

Application filed July 24, 1920. Serial No. 398,763.

To all whom it may concern:

Be it known a that I, HANS FREDERIK BARKER JoRGEN-SEN, subject of theKing of Denmark, residing at Vejrogade 7 Copenhagen, Denmark, haveinvented certain new and useful Improvements in Processes for Productionof Heat-Exchanging Bodies, of which the followin is a specification.

This invention re ates to the manufacture 10 of hollow, cellularheat-exchange bodies such as automobile radiators and the like.

The invention involves an improved process for the manufacture of suchbodies, by

' electrolytic deposition on a matrix of easilyfusible metal ormetal-alloys, for instance, a tin-lead alloy of any suitable proportion,which matrix is subsequently removed from the deposit by melting it out.As examples of alloys which may be satisfactorily used, the followingmay be given, viz:

' Lead, 80%; antimony, 12%; tin, 8%. Or, lead, 73%; antimony, 8%; tin,19%.

According to the invention, the electro- "lytic deposition of themetal-on the matrix or core is commenced in a non-acid depositing bathand is continued therein until a firm coating of deposited metal isproduced thereon, whereupon the core with the coating thus deposited iswashed and then immersed in the depositing bath proper and retainedtherein until the coating has attained the requisite thickness. Thenon-acid bath may consist of:

Water 1,000 gr.

85 Crystalline sodium carbonate 20 gr. Acid sodium sulfate 20 gr.Granulated copper acetate 20 gr. Pure cyanide 20 gr.

Instead of this bath, a neutral bath may to the invention, Figures 1 and2 thereof bemg fragmental front and side elevations,

respectively, of such radiator, and Figure .3 a section along the lineIIIIII of F igure 1.

Referring more particularly to said drawing, a indicates either thefront or the rear wall of the radiator, 12 its side wall, 0 its supplyor discharge nipple and d the passages for the air. These passages areof double conical shape, expanding towards both ends in order to securecompactness of the material deposited on the walls thereof; the reasonbeing that if the core is placed in the bath in such a manner that theaxes of the channels are horizontal, hydrogen will be deposited at thetop of the passages,

whereas if the passages expand towards both ends, it can easily escape.

In the above it has been assumed'that the entire heatexchang'e body tobe constructed is made in a single piece; but the invention mayobviously be modified in such a manner that the body is divided intopieces or elements of suitable sizes which are constructed singly andsubsequently joined together as .core by melting it out.

2. The herein-described process of manufacturing automobile radiators,comprising preparing a fusible metallic core; then de- Q eas es positinga metal upon said core, such deposithe same metal as that from which thecore tion being commenced in a non-acid deposit- Was Constructeding-bathand continued therein until. a firm In testimony whereof I affiX ySignature 10 coating is produced on the core and then HAN FREDERIKBARKER JGRGENSEN.

5 completed in the depositing bath proper; Witn and finally melting saidcore to remove the O, ME same by immersing it in a molten body of CARLMENNINSEN

